OLED Display Panel Signal Conversion Circuit for Gate Leakage Reduction
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Solution Overview
Problem
In OLED display panels, gate leakage current due to unstable gate voltage affects the luminous brightness and display effect, primarily caused by the leakage of gate charges through initialization transistors.
Innovation Solution
Incorporating a signal conversion circuit that converts initialization signals into specific initialization signals to maintain a controlled voltage difference between the initialization transistor's electrodes and the driving transistor's gate, reducing leakage current and stabilizing the gate voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the initialization transistor is used to initialize the driving transistor, then the gate voltage can be set initially, but gate leakage current occurs causing unstable gate voltage
Solution Approach 1:
A signal conversion circuit is introduced as an intermediary between the initialization signal source and the initialization transistor. This circuit converts the initialization signal into a first initialization signal with a controlled voltage difference relative to the data signal, thereby mediating the initialization process to reduce gate leakage current while maintaining initialization capability.
Solution Approach 2:
The voltage difference between the initialization signal and the data signal is controlled within a specific range (first preset range). By adjusting and constraining this voltage parameter, the gate leakage current is reduced while preserving the necessary initialization function of the driving transistor.
2Device complexity
If a fixed initialization signal is applied, then the initialization process is simple, but the voltage difference may be too large causing excessive leakage current
Solution Approach 1:
The signal conversion circuit serves as a mediator that transforms the simple fixed initialization signal into a optimized first initialization signal. This conversion maintains circuit simplicity while controlling the voltage difference to minimize energy loss through gate leakage.
Solution Approach 2:
By dynamically adjusting the voltage difference parameter within the first preset range based on the data signal, the system optimizes the initialization process to reduce gate leakage current without significantly complicating the overall circuit structure.
3Reliability
If the voltage difference between initialization signal and data signal is large, then initialization is effective, but gate leakage current increases
Solution Approach 1:
The voltage difference between the first initialization signal and the data signal is precisely controlled within the first preset range. This parameter optimization ensures sufficient initialization effectiveness while minimizing gate leakage current by avoiding excessively large voltage differences.
Solution Approach 2:
The signal conversion circuit uses the data signal as a reference to generate the first initialization signal, creating a feedback mechanism that automatically adjusts the voltage difference to an optimal range, balancing initialization effectiveness with leakage current reduction.
Data Source
AI summary
Provided are a display panel, a driving method thereof and a display device. The display panel includes a substrate, multiple sub-pixels located on one side of the substrate, and at least one signal conversion circuit. Each sub-pixel includes a pixel driving circuit and a light-emitting element. The pixel driving circuit includes an initialization transistor and a driving transistor. A first electrode of the initialization transistor is electrically connected to a gate of the driving transistor. The signal conversion circuit may convert a received initialization signal to a first initialization signal or convert the initialization signal to a second initialization signal according to a received data control signal, and generate an output of the conversion to the second electrode of the initialization transistor. This can avoid an unstable gate voltage of the driving transistor caused by a leakage current, further improve the display effect.